Fuse



Oct. 9., 1923. 1,470,440

G. w. GOODRIDGE -FUSE med May 1a, 121

will A r IIIVEIITUR G1 Leenyw- Gooosloee ATTORNEYS iatenied Oct. 9, 1923.

UNITED STATES GILBERT u GOODRIDGE, 01T BBIIGEPORT, C'NNETS ELECTRIC COMPANY, 01? BRXEGL CGllEICTIiEUT, Lili? NECTICUT.

Application tiled l, 192i. Serial Xa. 1530,:1120.

To all whom it may conce/'n Be it known that l. (iinnnn'r W; thionnniun. ya. citizen of the llnited States oi America,

and residingr in thc city ot' Bridgeport,

5 county of Fairfield, and State of t`onnecticut. have invented certain new and useful Improvements in Fuses, of which the. tollowing is a specification.

My Ainvention relates to fuses` and par ticulai'ly to a fuse of the plug type with renewable fuse cartridge, the object of' my invention being to provide a simple and rugged construction convenientl5v handled, readily manufactured, and etiieieut in operation. n

In the accompanying drawings--u Fig. 1 is a vertical section through a. fuse plug in which my invention is embodied in one form; l

Figs. .2 to 6 combined constitute a. dropped perspective ot the fuse plug. the figures showing consecutively perspective views of the insulating body, the serewshell, the reinforcing washer, the rivet and insulating Cap;

Fig. 7 is a perspective of the renewable 4fuse cartridge showing one end cap de tached;

Fig. 8 is a perspective of the fuse strip;

Fi rs. 9 und 10 are partial vertical seotions showing spring-holdingmeans of t'litierent types by which the fuse cartridge is maini tained in position; and

Fig. 11 is a side elevation of a fuse Cap showing another' device for this purpose.

Referringto the drawings, whicbxillutrate the invention in a form subject. to various modifications, the plug element. of the device comprises a pair of insulating members 9 and 10. the former constituting the insulating body of the plug, and the latter tbe manipulating cap. The body it 'is arranged at the entering end of the plug and is provided with a. central longitudinally. extending chamber or passage 1 1 to receive the renewable fuse cartridge 12. .fin ex terior shoulder 13 adjacenty the nose of the body 9 affords an abutment engaged. by the spun-over flange 14 of the screw shell side Contact 15. The latter basan end web 16 rovided with radial ribs 17 and a centering ss 18 with aperture 19. The web 16 rests in a seat 20 formed in the inner face of the. cap 10, and having channels 2 1 to receive' ,cartridge easing.

the ribs 17. The boss 18 enters a. eorrespondf ing well. Q2 in the cap 10 and its hole l registers with hole 23 to receive the rivet. 241. The latter is passed through the holes 1S)i the 23 and spun over in the in the outer face of the but-ton 10. y lil Preferably, a reintereing washer 2@ is interposed between the head of the rivet 24 and the web 1G ot the screw shell, not only to reinforce and thus protect the web against inl *l ring' the-rivetingJ operation, but press the web ribs 17 in the chann on the fastening of the parts toria rivet 2li. not oniy are ,lier b the buttons tl :ind 10 assembled., but the. engagement between the ribs 17 and chan nels 21 firmly established, thus insuring the rotation of 4the screw shell with 'the cap 1i) both directioi'is7 that to say. during in the insertion and removal of the plug.

A center Contact 'for the plug is afforded by one of the end caps Z7 of the cartridge fuse 1Q. when the later is inserted inthe cham ber 11 of the button 9. The other cap 28 of the fuse cartridge bears against. the inner faee of the washer 2G and thus establishes eleetrical connection through the washer 536 with the screw slieli'side Contact 15. Between the caps Q7 and 2S of the fuse cartridge ex tends the fuse strip 2.9, the ends 30 of which are. angled over the ends of the cartridge easing 19.. When rthe plug is inserted in i receptacle, with the cap 27 of the cartridge firmly bottomed against the center oontwct of the receptacle, the draw-up pressure exerted throu li the screw shell 15 presses the caps 27 an E28 firmly against the ends of the fuse strip and insures good electrical connect: i between the latter and tbe caps. In ordi.- to support the ends of the. and prevent them from being t' the insu ng paper easing of tb p iride t .e ends of the lat.

for; les 31, over 'which the ends fuse These .torrides preferably take the forro Usbaped rii'igs spur; or otherwise compressed en ends of the' Moreover. these metil rings 81 are not sulig'eet to shrinkage or other variation in dimensions, to which the :per casin of the cartridge is possibly su ject, and t rey thus insure good contact between the caps 27 and 28 and the bent-over ends of. the fuse strip. The cartridge element may be lled with a gas-absorbing powder in which the fuse element is embedded, thus minimizing danger ot' injury to the part-s on the rupture o't' the fuse.

lVhile the fuse cartridge may be freely mounted in position as shown in Fig. l. l prefer to provide some means for holding it in the fuse chamber l1. Friction means ot' different types are indicated in Figs. 9. ttl and ll. Thus in Fig. 9 one ot' the end caps (2S) has riveted thereto a spring fork QS() which projects into and trictionally grips the inner face ot' the hollow rivet 2l, ln Fig. l0 a spider with spring finger Q81 is riveted to the cap `and engages the walls of the fuse chamber l1. ll'hile. in Fig. 1l the cap has spring teats i282 toi-med in its side flange for the same purpose.

)is an added feature ot' satety. l provide the screw shell with a ring 33 ot insulating material adjacent the cap'but'ton 1t). which serves to protect the lineman against accidental contact with the shell during the manipulation of the plug.

The particular nature of the mechanical connection between the screw shell and the cap lt) to insure their rotation as a unit. may be variously modified. Similarly. the end terrulesl 3l otl the cartridge are not necessary under all conditions, hut they are deemed advisable as a safety factor ot the construction.

The caps 2i' and QS sleeve freely over the end ot the cartridge casing with no other engagement than the t'rietional grip'of a close tit. (ln the blowing ot the t'use element, it is possible to renew the i'use strip, but. inasmuch as the cartridge tuse element is ol" very inexpensive const ruction. it is pret'erred to discard the blown cartridge and substitute a Fresh one, without' attempting to substitute a fuse strip in the cart ridge. The buttons tl and lt) are simple to mold and present a rugged insulating hody to which the metal parts are readily attached and all assembled by thel simple expedient ot spinning over the. end of the single rivet 2st. The tubular construction ot the latter enables the lineman to readily torce out the fuse cartridge., should it adhere` by inserting the end ot a screw driver through the rivet into the fuse chalutier. where it bears directly on the end ot the t'use cap.

Various modifications in details ot construction will readily occur to those skilled in the art` without. departing trom the underlying thought ot' my invention as em` bodied in the construction shown, or as pointed out in the following claims:

I claim 1. A fuse device of the plug type having cap and body elements ol insulating material, a screw shell side contact encasing the body element and having in assembled condition an end web engaged between the adjacent faces of the cap and body elements, and an adjacent cylindrical uon-thrtauled area7 said body element having a longitudinally extending chamber open at the entering end of the plug to receive a renewable fuse cartridge, together with an external insulating ring arranged on said cylin- .drical portion ot the said screw shell adjacent and confined between the threaded area of the shell and the cap element to prevent accidental contact with the shell during the manipulation ot' the plug,

2.. In a fuse device of the plug type des scribed, a fuse cartridge having an insulating body` contact rings on the ends ot' said body, a fuse having its ends angled over said contact rings. and end caps passed treely over said ends into trictional engagement. therewith and with the bent-over ends ot' `the fuse strip.

3. A fuse device of the plug type having cap and body elements of insulating material, a screw shell side contact encasing the body element and having in assembled condition an end web engaged between the adjacent faces ot' the cap and body elements, said body element having a longitudinally extending chamber open at the entering end of the plug to receive a renewable fuso cartridge, together with a reenforeing washer interposedbetween the body member and shell web, and securing means passing through the cap` web and washer and serving to hold the parts assembled.

Ll. A fuse device of the plug type having cap and body elements of insulating material` a screw shell side contact encasing the body element and having in assembled condition an end web engaged between thel adjacent faces otl the cap and body elements, said body elementI having a longitudinally extending chamber open at the entering end ot' the plug to receive tridge, together with a reentorcing washer interposed between the body member and shell web, and a tubular rivet piercing said cap, wel) and washer and uniting the same, thel hole in said rivet opening to the chamber in the body element.

In testime Y whereof l have signed my name to this specification.

GILBERT W. GOODRIDGE.

a renewable tuse car- 

